PHP反向代理（转）

<?php
class PhpReverseProxy{
    public $publicBaseURL;
    public $outsideHeaders;
    public $XRequestedWith;
    public $sendPost;
    public $port, $host, $ip, $content, $forward_path, $content_type, $user_agent,
        $XFF, $request_method, $IMS, $cacheTime, $cookie, $authorization;
    private $http_code, $lastModified, $version, $resultHeader;
    const chunkSize = 10000;
    public function __construct()
    {
        $this->version = "PHP Reverse Proxy (PRP) 1.0";
        $this->port = "8080";
        $this->host = "127.0.0.1";
        $this->ip = "";
        $this->content = "";
        $this->forward_path = "";
        $this->path = "";
        $this->content_type = "";
        $this->user_agent = "";
        $this->http_code = "";
        $this->XFF = "";
        $this->request_method = "GET";
        $this->IMS = false;
        $this->cacheTime = 72000;
        $this->lastModified = gmdate("D, d M Y H:i:s", time() - 72000) . " GMT";
        $this->cookie = "";
        $this->XRequestedWith = "";
        $this->authorization = "";
        set_time_limit(0);//设置过期时间为永不过期
    }
    public function translateURL($serverName)
    {
        $this->path = $this->forward_path . $_SERVER['REQUEST_URI'];
//        if(IS_SAE)
//            return $this->translateServer($serverName) . $this->path;
        if($_SERVER['QUERY_STRING'] == "")
            return $this->translateServer($serverName) . $this->path;
        else
            return $this->translateServer($serverName) . $this->path . "?" . $_SERVER['QUERY_STRING'];
    }
    public function translateServer($serverName)
    {
        $s = empty($_SERVER["HTTPS"]) ? '': ($_SERVER["HTTPS"] == "on") ? "s":"";
        $protocol = $this->left(strtolower($_SERVER["SERVER_PROTOCOL"]), "/").$s;
        if($this->port=="")
            return $protocol."://".$serverName;
        else
            return $protocol."://".$serverName.":".$this->port;
    }
    public function left($s1, $s2){
        return substr($s1, 0, strpos($s1, $s2));
    }
    public function preConnect(){
        $this->user_agent = $_SERVER['HTTP_USER_AGENT'];
        $this->request_method = $_SERVER['REQUEST_METHOD'];
        $tempCookie = "";
        foreach($_COOKIE as $i => $value) {
            $tempCookie = $tempCookie . " $i=$_COOKIE[$i];";
        }
        $this->cookie = $tempCookie;
        if(empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
            $this->XFF = $_SERVER['REMOTE_ADDR'];
        } else {
            $this->XFF = $_SERVER['HTTP_X_FORWARDED_FOR'] . ", " . $_SERVER['REMOTE_ADDR'];
        }
    }
    public function connect(){
        if(empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
            $this->preConnect();
            $ch = curl_init();
            if($this->request_method == "POST"){
                curl_setopt($ch, CURLOPT_POST, 1);
                $postData = array();
                $filePost = false;
                $uploadPath = 'uploads/';
                if(IS_SAE)
                    $uploadPath = SAE_TMP_PATH;
                if(count($_FILES) > 0){
                    if(!is_writable($uploadPath)){
                        die('You cannot upload to the specified directory, please CHMOD it to 777.');
                    }
                    foreach($_FILES as $key => $fileArray){
                        copy($fileArray["tmp_name"], $uploadPath . $fileArray["name"]);
                        $proxyLocation = "@" . $uploadPath . $fileArray["name"] . ";type=" . $fileArray["type"];
                        $postData = array($key => $proxyLocation);
                        $filePost = true;
                    }
                }
                foreach($_POST as $key => $value){
                    if(!is_array($value)){
                        $postData[$key] = $value;
                    }else{$postData[$key] = serialize($value);
                    }
                }
                if(!$filePost){
                    $postData = http_build_query($postData);
                    $postString = "";
                    $firstLoop = true;
                    foreach($postData as $key => $value){
                        $parameterItem = urlencode($key) . "=" . urlencode($value);
                        if($firstLoop){
                            $postString .= $parameterItem;
                        }else{
                            $postString .= "&" . $parameterItem;
                        }
                        $firstLoop = false;
                    }
                    $postData = $postString;
                }
                //curl_setopt($ch, CURLOPT_VERBOSE, 0);
                //curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
                //curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible;)");
                $this->sendPost = $postData;
                curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
                //curl_setopt($ch, CURLOPT_POSTFIELDS,file_get_contents($proxyLocation));
                //curl_setopt($ch, CURLOPT_POSTFIELDS,file_get_contents("php://input"));
            }
            $translateURL = $this->translateURL(($this->ip) ? $this->ip : $this->host);
            if(substr_count($translateURL, "?") > 1){
                $firstPos = strpos($translateURL, "?", 0);
                $secondPos = strpos($translateURL, "?", $firstPos + 1);
                $translateURL = substr($translateURL, 0, $secondPos);
            }
            curl_setopt($ch, CURLOPT_URL, $translateURL);
            $proxyHeaders = array(
                "X-Forwarded-For: " . $this->XFF,
                "User-Agent: " . $this->user_agent,
                "Host: " . $this->host
            );
            if(strlen($this->XRequestedWith) > 1){
                $proxyHeaders[] = "X-Requested-With: " . $this->XRequestedWith;
            }
            curl_setopt($ch, CURLOPT_HTTPHEADER, $proxyHeaders);
            if($this->cookie != ""){
                curl_setopt($ch, CURLOPT_COOKIE, $this->cookie);
            }
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
            curl_setopt($ch, CURLOPT_AUTOREFERER, true);
            curl_setopt($ch, CURLOPT_HEADER, true);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            $output = curl_exec($ch);
            $info = curl_getinfo($ch);
            curl_close($ch);
            $this->postConnect($info, $output);
        }else {
            $this->lastModified = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
            $this->IMS = true;
        }
    }
    public function postConnect($info, $output){
        $this->content_type = $info["content_type"];
        $this->http_code = $info['http_code'];
        if(!empty($info['last_modified'])){
            $this->lastModified = $info['last_modified'];
        }
        $this->resultHeader = substr($output, 0, $info['header_size']);
        $content = substr($output, $info['header_size']);
        if($this->http_code == '200'){
            $this->content = $content;
        }elseif(($this->http_code == '302' || $this->http_code == '301') && isset($info['redirect_url'])){
            $redirect_url = str_replace($this->host, $_SERVER['HTTP_HOST'], $info['redirect_url']);
            if(IS_SAE)
                $redirect_url = str_replace('http://fetchurl.sae.sina.com.cn/', '', $info['redirect_url']);
            header("Location: $redirect_url");
            exit;
        }elseif($this->http_code == '404'){
            header("HTTP/1.1 404 Not Found");
            exit("HTTP/1.1 404 Not Found");
        }elseif($this->http_code == '500'){
            header('HTTP/1.1 500 Internal Server Error');
            exit("HTTP/1.1 500 Internal Server Error");
        }else{
            exit("HTTP/1.1 " . $this->http_code . " Internal Server Error");
        }
    }
    public function output(){
        $currentTimeString = gmdate("D, d M Y H:i:s", time());
        $expiredTime = gmdate("D, d M Y H:i:s", (time() + $this->cacheTime));
        $doOriginalHeaders = true;
        if($doOriginalHeaders){
            if($this->IMS){
                header("HTTP/1.1 304 Not Modified");
                header("Date: Wed, $currentTimeString GMT");
                header("Last-Modified: $this->lastModified");
                header("Server: $this->version");
            }else{
                header("HTTP/1.1 200 OK");
                header("Date: Wed, $currentTimeString GMT");
                header("Content-Type: " . $this->content_type);
                header("Last-Modified: $this->lastModified");
                header("Cache-Control: max-age=$this->cacheTime");
                header("Expires: $expiredTime GMT");
                header("Server: $this->version");
                preg_match("/Set-Cookie:[^\n]*/i", $this->resultHeader, $result);
                foreach($result as $i=>$value){
                    header($result[$i]);
                }
                preg_match("/Content-Encoding:[^\n]*/i", $this->resultHeader, $result);
                foreach($result as $i=>$value){
                    header($result[$i]);
                }
                preg_match("/Transfer-Encoding:[^\n]*/i", $this->resultHeader, $result);
                foreach($result as $i=>$value){
                    header($result[$i]);
                }
                echo($this->content);
            }
        }else{
            $headerString = $this->resultHeader; //string
            $headerArray = explode("\n", $headerString);
            foreach($headerArray as $privHeader){
                header($privHeader);
            }
            if(stristr($headerString, "Transfer-encoding: chunked")){
                flush();
                ob_flush();
                $i = 0;
                $maxLen = strlen($this->content);
                while($i < $maxLen){
                    $endChar = $i + self::chunkSize;
                    if($endChar >= $maxLen){
                        $endChar = $maxLen - 1;
                    }
                    $chunk = substr($this->content, $i, $endChar);
                    $this->dump_chunk($chunk);
                    flush();
                    ob_flush();
                    $i = $i + $endChar;
                }
            }else{
                echo($this->content);
            }
        }
    }
    public function dump_chunk($chunk){
        echo sprintf("%x\r\n", strlen($chunk));
        echo $chunk;
        echo "\r\n";
    }
    public function getOutsideHeaders(){
        $headers = array();
        foreach($_SERVER as $name => $value){
            if(substr($name, 0, 5) == 'HTTP_'){
                $name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
                $headers[$name] = $value;
            }elseif ($name == "CONTENT_TYPE") {
                $headers["Content-Type"] = $value;
            }elseif ($name == "CONTENT_LENGTH") {
                $headers["Content-Length"] = $value;
            }elseif(stristr($name, "X-Requested-With")) {
                $headers["X-Requested-With"] = $value;
                $this->XRequestedWith = $value;
            }
        }
        $this->outsideHeaders = $headers;
        return $headers;
    }
}
?>